Evaporator for liquids



E. W|RTH-FREY.

EVAPORATOR FOR LIQUIDS. APPLICATION FILED JAN. 6, 1920.

1,437,698. Patented Dec. 5,1922.

Patented Dec. 5, 1921 IABtt ELIAS VIIBTH-FREY, OF AARAU; SVITZEBLAND,ASSIGNOB TE) PrKTIENGESEl-LSCHAFT KUMMLER & MATTER. OF AABAU,SWITZERLAND.

nvnronn'ron ron riieurnsfi Application filed January 6, Serial Ne.349,781;

To all whom it may concern." I

Be it'known that LELIAs WInrH-FnnY, a

citizen of the Republic of Switzerland, resid- P ingat Aarau,Laurenzvorstadt, Switzerland,

have invented certain new and useful Im-- provements in Evaporators'torLiquids; and I do hereby declare the following to be a "clear, full, andexactdescription of the invention, such as will enable others skilledin} the art to which it appertains to make and use the same, referencebeing had to the accompanying drawing and to letters or fig ures ofreference marked thereon, which form a part ofthis specification.

This invention relates to improvements in heat interchange devices andparticularly to heating bodies used in evaporating liquids;

Experiments carried out on evaporators for liquids provided withvertical heated channels for the circulation and evaporation of theliquid to be evaporated, have shown that the precipitation in solid formof substances contained in the liquid such as salts, takes placepreferably at the upper edge of these channels, thus causing a rapiddiminution of the effective area of the passage and of the transmissionof heat at these points and it may even lead to a complete filling up ofthe area of the channels whereupon the evaporation is then made totallyimpossible.

The object of this invention is to eliminate the drawback referred to.To this end the walls of the channels for the passage of the liquid inthe evaporator are provided with a scraping device for the purpose ofpreventing the formation of scale at the walls of said channels byactuating said.

scraping device.

The accompanying, drawing illustrates way of example two modes ofcarrying'out the invention and a number of details thereof. In thisdrawing:

Fig. l is a vertical section through an evaporator for liquids providedwith a heat ing body of concentrically arranged vertical annularchambers and fitted with a scraping device.

Fig. 2 is a plan thereof.

F 3-10 show in front and side views four different exemplifications ofthe scrap ers adapted to work on the upper edge of the heating body.

Fig. 11 is a vertical section through an evaporator provided with ascraping device,

- -Referring at first to i 7 drawing, 1 designates a cylindrical evapo-.horizontal rod and thescraper blades 6 the scraper blades ct whichextend over the greatest part of the outer surfaces of theheatingfbodles. v

igs. 1 and E2 of the rating vessel. l vithin this vessel 1 verticalhollow annular'heating bodies 2 are arranged concentrically one withinthe other. The

"hollow spaces '3 or these bodies communicate plurality of with a pipe 4and by means of a connecting pipes 5 witlreach other. The scraper blades.6 are arranged above the upper edges of the heating bodies 2 and-actlike clamps which project over the upper edges of said bodies.Saidscraper blades 6 are fixed to vertical rods 7, which are carried ona horizontal rod 8 the latter being fined to a vertical shaft 9. A bevelwheel 10 is mounted on said vertical shaft. Any rotating motion impartedto said bevel-wheel causes the scrapers to move along the circular edgesof the heating bodies. The vertical rods 7 are adapted to be adjustedalong the are preferably arranged react in a resilient manner on theheating bodies in order to avoid any troubles thatmight arise from theedges of the hollow bodies 2 not being uniform in shape when the shaft 9andwith it the scraping device is rotating and making thus a machiningof said edges not necessary.

In imparting rotation to the shaft 9 the upper edges or" the heatingbodies 2 are thus scraped and any precipitation in the act of beingdeposited removed with the object to maintain a tree passage for thecirculation of the liquid and to provide for an unrestricted heatinterchange between the heating bodies and theliquid.

The scrapers shown in Figs. 3, 4, 7, 8, 9 is shown in Figs. 3 and 4 ofthick wires, or flat scrapers as shown in Figs. 7 and 8 may be used.Figs. 5 and 6 illustrate scrapers adapted to be used on rectangularedges of heating bodies, and in Figs. 9 and 10 scrapers are shown whichare provided with ins terohangeable shoes 11 acting as scraping faces.

The scrapers shown in Figs. 3, 4c, 7, 8 9 and 10 are bent in such a waythat they are pressed by their own spring action in a re silient manneragainst the surfaces of the heating body, the scraper shown in Figs. 5and 6 is a plate spring. 7

Another modification of the scrapers is shown in Fig. 11 which differfrom those shown in detail in their respective length in as much as thescrapers shown in Fig. 11 extend over the greater part of the height :vthe heating bodies.

W hat I claim now as my invention is:

1. Evaporator for liquids, consistingoi a vessel, of vertical hollowannular heating bodies concentrically arranged one within the other andinside the vessel, a scraping rotatable device acting on the outersuriaces of said heating bodies durbodies "for the purpose of preventingthe precipitation of scale on said heating bodies. Evaporator forliquids, consisting of a vessel, of vertical annular hollow heatingbodies concentrically arranged one within the other and inside thevessel, a scraping device acting on the upper edges of the surfaces ofsaid heating bodies and provided with scrapers of clamp shape, whichproject over the upper edges of the heating bodies, said scrapers beingcarried on a rotatable member acting as beam.

Evaporator for liquids, consisting of a vessel, oi vertical annularhollow heating bodies concentrically arranged one within the other andinside the vessel, a scraping device acting on the upper edgesof thevessel, of vertical annular hollow heating bodies concentricallyarranged one within the other and inside the vessel, ascraping deviceacting on the upperedges of, the surfaces of. said heating bodiesandprovided with scrapers which projectover the upper edges or" the heatingbodies, and press against said edges in a resilient manner, saidscrapers being carried on rotatable beam and arranged adjustably inthedirectionoii the beam, for the purposeot preventlng the precipitation ofsubstances contained in the liquid to be evaporated in the shape ofscale on said bodies.

v6, Evaporator for liquids, consisting of a vessel, of vertical annularhollow heating bodies, concentrically arranged one within the-other andinside the vessel,a scraping device acting on the upper edges of thesurfaces of said heating bodies-and provided with scrapers which projectover the upper edges oi the heatingbodies and press against said edgesin a resilient manner, said. scrapers being carried on a rotatable beamand arranged adjustably in the direction of the beam and provided withinterchangeable scraping faces, for the purpose oi preventing theprecipitation of substances contained inthe liquid to be evaporated in lthe shape of scale on said bodies.

In testimony that 1 claim the foregoing as my invention, 1 have signedmy name.

ELIAS WInrH-FREY.

